chane



To allwhom it may concern: i Be it known thatwe, J ONATHAN'J OHNSON andJ OHN E. CRAN of Lowell, in the county gof Middlesex and StateofMassachusetts, I haveyinventedcertainnew and useful Imf x provements inStovesand other Heating Apj ,paratuses and we do hereby declare that thej following is afull, clear, and exact description of the same,reference being had to the annexed drawings, making a part of thisspecificatiom in whichi n Figure 1, isja plan or top view of a stoveconstructedaccordingto our improved mode. Fig.2, isxa vertical Sectionof ditto, the plane "ofsection beingfthrough the center. Fig. 3, qisanelevation of ditto. Fig. 4, is a section of the cold airpassage,valve, evaporator, and a portion ofthe air heating passage, the plane ofsection being at rightangles with it-he planeof section oflFig. 2. n i rSimilar letters of reference indicate correi f spending part-sin theseveral figures.

i The nature of our jinvention consists, 1st, inplacing a valve betweenthe cold air and 'airheating passages for thepurpose aswill behereaftershown. i v i .1 Our inventionvconsistsin the employment of a valve incombination witha bridge ar- Jranged as will be hereafter fully shownand described. f i 11 y 1 Toenableothers skilled in the art to fully gproceedto describe it. i A representstheoutercasing of a stove similarto those inuse. y

"B lS the fire grate; f n

C is the ash pit. 1 r i i i i Dfiisthe hearth andj E are legs secured toi 1 the hearth to support the stove.

f Wh lCh is suppliedwithya suitable quantity ofwater, the drawer beingin fact a water tank,see G, Figs; 23 and 4, and at the upper part oftheback end of this tank a pipe F is attached, said pipe communicatingwith the tank Gr. ThepipeFis intendedgto convey cold airfromthe outsideof the building 1 floor, or be arranged in a n n n y convenient waythatwill answer thepurpose.

At the end of this pipe where 1t enters the n opens inward, the upper ede ofjthe valve [having a' joint or hinge attac ment, see Flg.

nderstand and construct our invent-ion we Underneath the hearthD thereis adrawer doors and windows. or other place to the inside of the watertank, throw or carryheated air down into the cold and said.pipemay beplaced beneath the tanlrG, thereis placed a valve H which f iS pecifi cation of Letters lateht No. 12,758, dated April 24,1855.

tank G may be constructed with a double bottom leaving a space K betweenas shown 1n F1gs.2 and 4.

L is an internal air heating passage ex- .tending upward from the watertank G beneath the hearth D, through the hearth,,the ash pit C, firegrate B,'and through the body of the stove said passage L communicating1 .J. JOHNSONANDJQELCRANE; or LOWELL,:MassAoIiUsE'rTs.

with the external air at the top of the stove. n

The fire chamber it willbe seen in consequence of the passage L is ofannular form,

and may be supplied with fuel through openwith the openings M. Orinstead of the above the usual fire door may be employed. R representsthe smoke pipe or the fianch on which the smoke pipe is fitted.

The cold air passes through the pipe F into the tank G, said air openingthe valve H, as indicated by the arrow in Fig. 4. The air is therebymoistened for the water in the tank is warmed by the heat from the stoveand is gradually evaporating and consequently moistens the air. The airpasses up the central passage L and becomes thor oughly heated as itpasses out at its top. New in case of a counter current of air passingdown the passage L the valve H will be closed thereby and the countercurrent will be prevented from passingthrough the cold air pipe F, andthe bridge I prevent-s the air from getting under the valve and forcingit open, by means of this bridge the counter current must act upon thevalve so as to close it.

The counter currents are extremely dangerous in using ordinary airheatin furnaces, and they frequently occur owing to the low temperatureof the air in the room caused frequently by the opening of the Thecounter currents air passage and the heated air often ignites wood workbelow and fires the building. Our invention prevents any danger ofthiskind. The water tank also will receive any cindersorscales that. mayfall from the in- ;nerside of the passage L, and thus danger resultingfrom that cause ispreventedr y We do not claim the central air heatingin the manner described, for the purpose passage L separately for thathas been prespecified.

viously used, but JONATHAN JOHNSON.

What We do claim as new and desire to se- JOHN E. CRANE. 5 cure byLetters Patent is Witnesses:

We claim the employment of the valve H A. E. BEACH,

in combination with the bridge J arranged WILLIAM TUSCH.

